Cerium oxide nanoparticles (CeO2 NPs) improve the developmental competence of in vitro-matured prepubertal ovine oocytes
F. Ariu A C , L. Bogliolo A , A. Pinna B , L. Malfatti B , P. Innocenzi B , L. Falchi A , D. Bebbere A and S. Ledda A
+ Author Affiliations
- Author Affiliations
A Dipartimento di Medicina Veterinaria, Università di Sassari, Via Vienna 2, 07100 Sassari, Italy.
B Laboratorio di Scienza dei Materiali e Nanotecnologie, Università di Sassari, e CR-INSTM, Palazzo del Pou Salid, Piazza Duomo 6, 07041 Alghero (Sassari), Italy.
C Corresponding author. Email: federica@uniss.it
Reproduction, Fertility and Development 29(5) 1046-1056 https://doi.org/10.1071/RD15521
Submitted: 7 July 2015 Accepted: 11 February 2016 Published: 22 April 2016
Abstract
The present study investigated whether supplementation with different doses of cerium dioxide nanoparticles (CeO2 NPs) during in vitro maturation (IVM) of prepubertal ovine oocytes influenced their embryonic development in vitro. Cumulus–oocyte complexes derived from the ovaries of slaughtered prepubertal sheep underwent IVM with CeO2NPs (0, 44, 88 or 220 µg mL–1). Matured oocytes were fertilised in vitro and zygotes were cultured for 7 days. The results demonstrated that CeO2NPs were internalised in the cumulus cells and not in the oocyte. The treatment with CeO2NPs did not affect nuclear maturation or intracellular levels of reactive oxygen species of the oocytes. The percentage of oocytes with regular chromatin configuration and cytoskeleton structures when treated with 44 µg mL–1 CeO2NPs was similar to oocytes matured in the absence of CeO2NPs and significantly higher than those treated with 88 or 220 µg mL–1 CeO2NPs. The relative quantification of transcripts in the cumulus cells of oocytes matured with 44 µg mL–1 CeO2NPs showed a statistically lower mRNA abundance of BCL2-associated X protein (BAX), B-cell CLL/lymphoma 2 (BCL2) and superoxide dismutase 1 (SOD1) compared with the 0 µg mL–1 CeO2 NPs group. A concentration of 44 µg mL–1 CeO2NPs significantly increased the blastocyst yield and their total, inner cell mass and trophectoderm cell numbers, compared with the 0 and 220 µg mL–1 groups. A low concentration of CeO2NPs in the maturation medium enhanced in vitro embryo production of prepubertal ovine oocytes.
Additional keywords: cytoskeleton, in vitro embryo production.
References
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